When new, OEM rubber exhaust hangers are fine for the stock exhaust system. But they simply don't hold up or perform well in performance applications. Over time rubber breaks down and increases the amount of exhaust system movement. This excessive movement can damage the exhaust system as well as allow the hot tip to contact the bumper. PERRIN Polyurethane exhaust hangers are extra stiff to help keep your exhaust system in place, away from your bumper and other undercarriage parts. Most clients can install a set of hangers in less than 30 minutes with simple hand tools!